Optics and Vision
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Questions and Answers

What is the effect of a larger pupil on the depth of field?

  • It has no effect on the depth of field
  • It decreases the depth of field (correct)
  • It increases the depth of field
  • It is dependent on the available light

    • What is the optimal pupil diameter range for the corrected eye?

  • 4-5 mm
  • 1-2 mm
  • 3-4 mm
  • 2-3 mm (correct)

    • What is the role of retinol in the eye?

  • Aiding in the production of moisture in the eyes
  • Supporting the healthy functioning of the conjunctiva
  • Allowing for vision in low light conditions (correct)
  • All of the above

    • What is the term for the ability to perceive distance to objects in the world using the visual system and visual perception?

    <p>Depth perception</p> Signup and view all the answers

    What is the effect of aberrations on retinal image quality for large pupil diameters?

    <p>They deteriorate retinal image quality</p> Signup and view all the answers

    What is the benefit of vitamin A in relation to eye health?

    <p>It decreases the chance of developing eye infections</p> Signup and view all the answers

    What is the primary function of the sphincter pupillae muscle in the eye?

    <p>To constrict the pupil</p> Signup and view all the answers

    During near visual acuity testing, where should the light source be placed?

    <p>Above or slightly behind the patient</p> Signup and view all the answers

    What is the purpose of the Light Perception (LP) test?

    <p>To assess the patient's ability to see light</p> Signup and view all the answers

    What is the calibrated distance for holding the near point card during visual acuity testing?

    <p>16 in (40cm)</p> Signup and view all the answers

    What is the term for the aperture or opening of the eye?

    <p>Pupil</p> Signup and view all the answers

    What is the name of the nerve that innervates the sphincter pupillae muscle?

    <p>3rd CN</p> Signup and view all the answers

    What is the term used to describe the aberrations that occur in a circular form?

    <p>Zernike polynomials</p> Signup and view all the answers

    What is the primary effect of spherical aberration in the eye?

    <p>Formation of secondary images in front of the normal focal point</p> Signup and view all the answers

    What is the purpose of the iris in reducing spherical aberration?

    <p>To act as a stop to reduce spherical aberration</p> Signup and view all the answers

    What type of distortion occurs when using a minus lens?

    <p>Barrel distortion</p> Signup and view all the answers

    What is the term used to describe the ability to detect a gap with a width of 1 minute of arc?

    <p>Normal resolving power</p> Signup and view all the answers

    Which type of visual acuity involves the minimum contrast of a target at which the patient can distinguish the target from the background?

    <p>Minimum visible threshold</p> Signup and view all the answers

    What is the term used to describe the smallest visual angle formed by the eye and 2 separate objects at which a patient can discriminate them individually?

    <p>Minimum separable threshold</p> Signup and view all the answers

    What is the term used to describe the smallest detectable amount of misalignment of 2 line segments?

    <p>Hyperacuity</p> Signup and view all the answers

    What is the primary reason for impairment of visual acuity when the pupil is dilated?

    <p>Spherical aberration</p> Signup and view all the answers

    What is the effect of the Stiles-Crawford effect on visual acuity?

    <p>Increased sensitivity to paraxial light</p> Signup and view all the answers

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